1616611551 has 8 divisors (see below), whose sum is σ = 2164734000. Its totient is φ = 1073115072.

The previous prime is 1616611547. The next prime is 1616611589. The reversal of 1616611551 is 1551166161.

1616611551 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1616611551 - 2² = 1616611547 is a prime.

It is a super-4 number, since 4×1616611551⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616612551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1155676 + ... + 1157073.

It is an arithmetic number, because the mean of its divisors is an integer number (270591750).

Almost surely, 2^1616611551 is an apocalyptic number.

1616611551 is a deficient number, since it is larger than the sum of its proper divisors (548122449).

1616611551 is a wasteful number, since it uses less digits than its factorization.

1616611551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312985.

The product of its digits is 5400, while the sum is 33.

The square root of 1616611551 is about 40207.1082148418. The cubic root of 1616611551 is about 1173.6408732859.

The spelling of 1616611551 in words is "one billion, six hundred sixteen million, six hundred eleven thousand, five hundred fifty-one".